12139400 has 192 divisors, whose sum is σ = 37497600. Its totient is φ = 3548160.

The previous prime is 12139381. The next prime is 12139409. The reversal of 12139400 is 493121.

12139400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (12139409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 418586 + ... + 418614.

It is an arithmetic number, because the mean of its divisors is an integer number (195300).

Almost surely, 2^12139400 is an apocalyptic number.

12139400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12139400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18748800).

12139400 is an abundant number, since it is smaller than the sum of its proper divisors (25358200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12139400 is a wasteful number, since it uses less digits than its factorization.

12139400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 12139400 is about 3484.1641752363. The cubic root of 12139400 is about 229.8259552873.

The spelling of 12139400 in words is "twelve million, one hundred thirty-nine thousand, four hundred".